The child lives in both the mom's and dad's house. Why should the dad pay for both houses? That's not fair at all.
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Child support is supposed to be used on anything that you wouldn't buy/pay for if you were child less excluding food. A person would still need to pay for their own house, car, light, gas, water, tv internet bills, so childsupport should not be used for that. If should be used for food, the child's clothes, the child's school, the child's activities. Whatever the child needs. Not what the mom needs. The mom should be able to pay for her own stuff.
The mother should be able to pay for her own shelter and her own water bills and other bills, just like the father is paying for his own. If she can't pay for her own house and stuff, then the father should get custody until she can make enough money to pay for her own stuff instead of using the child's money.
The one who has custody spends more time with the child obviously. The only time it is proven that they spend more money on the child is if they make more than the person who doesn't have custody, and women usually date up so...